EP 1491866 A4 20060607 - FLOW RATE MEASURING METHOD AND FLOWMETER, FLOW RATE MEASURING SECTION PACKAGE USED FOR THEM AND FLOW RATE MEASURING UNIT USING THEM, AND PIPING LEAKAGE INSPECTION DEVICE USING FLOWMETER
Title (en)
FLOW RATE MEASURING METHOD AND FLOWMETER, FLOW RATE MEASURING SECTION PACKAGE USED FOR THEM AND FLOW RATE MEASURING UNIT USING THEM, AND PIPING LEAKAGE INSPECTION DEVICE USING FLOWMETER
Title (de)
STRÖMUNGSGESCHWINDIGKEITSMESSVERFAHREN UND STRÖMUNGSMESSER, DAFÜR VERWENDETE STRÖMUNGSGESCHWINDIGKEITSMESS-ABSCHNITTSGEHÄUSE UND STRÖMUNGSGESCHWINDIGKEITSMESSEINHEIT DAMIT UND ROHRLECKUNTERSUCHUNGSEINRICHTUNG MIT STRÖMUNGSMESSER
Title (fr)
PROCEDE DE MESURE DE DEBIT ET DEBITMETRE, ENSEMBLE SECTION DE MESURE DE DEBIT UTILISE POUR CEUX-CI ET UNITE DE MESURE DE DEBIT LES UTILISANT, ET DISPOSITIF D'INSPECTION DE FUITE DE CANALISATIONS UTILISANT UN DEBITMETRE
Publication
Application
Priority
- JP 0303251 W 20030318
- JP 2002079180 A 20020320
- JP 2002083412 A 20020325
- JP 2002105336 A 20020408
Abstract (en)
[origin: US2006005620A1] Measurements are obtained by a computing unit based on an output Vh from an indirectly-heated constant-temperature controlling flow rate measuring section ( 16 ) and an output Vout from a two-constant-point temperature difference detecting flow rate measuring sections ( 18 a, 18 b). In the flow rate measuring section ( 16 ), a heating element ( 163 ) is feedback-controlled based on a detected temperature by a heat sensing element ( 162 ) to obtain an output Vh based on the feedback-controlled condition. An output Vout is obtained from flow rate measuring sections ( 18 a, 18 b) based on the detected temperature difference between a heat sensing element ( 182 ) disposed on the liquid-flow-direction upstream side of the flow-rate measuring section ( 16 ) and a temperature sensing element disposed on the downstream side. A computing unit outputs as a measurement a flow rate obtained based on the output Vh in a flow rate region where a flow rate is larger than a predetermined boundary flow rate, and outputs as a measurement a flow rate obtained based on the output Vout in a flow rate region where it is less than a boundary flow rate. Accordingly, a flow rate is measured with good precision and sensitivity over a wide flow rate range from a trace-amount flow rate region to a comparatively large flow rate region.
IPC 8 full level
G01F 1/68 (2006.01); G01F 1/684 (2006.01); G01F 1/699 (2006.01); G01F 7/00 (2006.01); G01M 3/28 (2006.01)
CPC (source: EP KR US)
G01F 1/68 (2013.01 - EP KR US); G01F 1/6847 (2013.01 - EP US); G01F 1/692 (2013.01 - KR); G01F 1/696 (2013.01 - KR); G01F 1/698 (2013.01 - KR); G01F 1/699 (2013.01 - EP US); G01F 7/00 (2013.01 - EP US); G01M 3/2807 (2013.01 - EP US)
Citation (search report)
- [A] EP 1094306 A1 20010425 - YAZAKI CORP [JP]
- [A] US 5557965 A 19960924 - FIECHTNER BRADLEY T [US]
- [A] DE 10017958 A1 20001221 - PETRAM GUENTER [DE]
- [A] US 5384714 A 19950124 - KIDD ROY E [US]
- See references of WO 03078934A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
DOCDB simple family (publication)
US 2006005620 A1 20060112; US 7028533 B2 20060418; CN 1643344 A 20050720; EP 1491866 A1 20041229; EP 1491866 A4 20060607; KR 20040097136 A 20041117; US 2005155421 A1 20050721; US 6973827 B2 20051213; WO 03078934 A1 20030925
DOCDB simple family (application)
US 19879905 A 20050805; CN 03806529 A 20030318; EP 03744524 A 20030318; JP 0303251 W 20030318; KR 20047013477 A 20030318; US 50809504 A 20040915